It follows btrfs BTRFS_IOC_CLONE_RANGE lead on ioctl number and
arguments.
Signed-off-by: Peng Tao <tao.peng@xxxxxxxxxxxxxxx>
---
fs/nfs/nfs4file.c | 14 ++++++++++++++
include/uapi/linux/nfs.h | 9 ++++++++-
2 files changed, 22 insertions(+), 1 deletion(-)
diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c
index e450a5f..f37b74c 100644
--- a/fs/nfs/nfs4file.c
+++ b/fs/nfs/nfs4file.c
@@ -262,14 +262,28 @@ out_drop_write:
mnt_drop_write_file(dst_file);
return ret;
}
+
+static long nfs42_ioctl_clone_range(struct file *dst_file, void __user *argp)
+{
+ struct nfs_ioctl_clone_range_args args;
+
+ if (copy_from_user(&args, argp, sizeof(args)))
+ return -EFAULT;
+
+ return nfs42_ioctl_clone(dst_file, args.src_fd, args.src_off, args.dst_off, args.count);
+}
#endif /* CONFIG_NFS_V4_2 */
long nfs4_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
+ void __user *argp = (void __user *)arg;
+
switch (cmd) {
#ifdef CONFIG_NFS_V4_2
case NFS_IOC_CLONE:
return nfs42_ioctl_clone(file, arg, 0, 0, 0);
+ case NFS_IOC_CLONE_RANGE:
+ return nfs42_ioctl_clone_range(file, argp);
#endif
}
diff --git a/include/uapi/linux/nfs.h b/include/uapi/linux/nfs.h
index d85748d..c6b86cc 100644
--- a/include/uapi/linux/nfs.h
+++ b/include/uapi/linux/nfs.h
@@ -33,7 +33,14 @@
/* NFS ioctls */
/* Let's follow btrfs lead on CLONE to avoid messing userspace */
-#define NFS_IOC_CLONE _IOW(0x94, 9, int)
+#define NFS_IOC_CLONE _IOW(0x94, 9, int)
+#define NFS_IOC_CLONE_RANGE _IOW(0x94, 13, int)
+
+struct nfs_ioctl_clone_range_args {
+ __s64 src_fd;
+ __u64 src_off, count;
+ __u64 dst_off;
+};
/*
* NFS stats. The good thing with these values is that NFSv3 errors are
--
1.8.3.1
--
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